package com.chenjt.jvm.first.six_methodArea;

import jdk.internal.org.objectweb.asm.ClassWriter;
import jdk.internal.org.objectweb.asm.Opcodes;

/**
 * 注释：
 * jdk6/7
 * -XX:PermSize=10m -XX:MaxPermSize=10m
 *
 * jdk8
 * -XX:MetaspaceSize=10m -XX:MaxMetaspaceSize=10m
 *
 * @author chenjt
 * @date 2025/6/10 14:49
 */
public class OOMTest extends ClassLoader{

    public static void main(String[] args) {
        int j = 0;
        try {
            OOMTest test = new OOMTest();
            for (int i = 0; i < 10000; i++) {
                // 创建ClassWriter对象，用于生成类的二进制字节码
                ClassWriter classWriter = new ClassWriter(0);
                // 指明版本号，修饰符，类名，包名，父类，接口
                classWriter.visit(Opcodes.V1_8,Opcodes.ACC_PUBLIC,"Class" + i,null,"java/lang/Object",null);
                // 返回byte[]
                byte[] code = classWriter.toByteArray();
                // 类的加载
                test.defineClass("Class" + i,code,0,code.length);// Class对象
                j++;
            }
        } finally {
            System.out.println(j);
        }
    }

}
